Feeding device for rock drills



July 1 9, 1 932. w. A. sMlTH, SR., ET AL 1868,294

FEDING DEVICE FOR ocx DRILLs Filed Jan. 24, 19:50

THE/l A TORNEY Patented July A19, 1932 UNirEn"sA'rATi-:fsv'PATENroI-i-"1ci-:1-

WILLrAM A. sMrfrfii, sn., or nAs'roN, PENNSYLVANIA, ANii WILLIAM A.SMITH, Jn., oir riirinirsnunag NEW JERSEY, AssrGNcns To INGERsoLL-BAND.COMPANY, or' I JEiasiiYciTY, NEW JnnsnY, A conPonATioN on NEW JERSEY, c

` FEEDINGVDEVICE FOR ROCK DRIiIiLS v Appncauon nieu January 24, 1930.serial-No. 423,066.

This invention relates to feeding devices, but more particularly ,to adevice of this character adapted for actuating a rock drill rela-`tively .to its support, such-as a shell whereon rock drills of thedrifter type are usually mounted to enable vthem to be readily advancedtowards the work inaccordance with the penetration-of the. drill steelinto the material being drilled.

One object of the invention is to enable the rock drill tobe movedlongitudinally of its supporting shell by the force of the hammer pistonuponreversal of said hammer piston at the end of one of its strokes andat the same time to prevent recoil of the rock drill at the insta-nt ofsuch reversal.

Another object is to enable the rock drill to be readily actuatedlongitudinally of the sh-ell either in the direction of the work or in areverse direction, and still another lobject is to enable the feedingdevice to be automatically reversed.

Other objects will be in part in part pointed out hereinafter. n

In the accompanying drawing illustrating the invention and in whichsimilar reference characters refer tosimilar parts,

Figure 1 isa longitudinalplan view, partly brolren away, of a .rockdrill and its supporting shellV having the invention. applied obviousand thereto,

- Figure 2'is a side elevation, partly in section, showing an enlargedview of the feeding device, the said feeding device being adjusted tothe position for feeding the rock drill towards the work, and

Figure 3 is an end elevation `ofFigure 2 and partly in sectionillustrating the man' ner in which the movable elements ofthefeeding/device may be locked in vplaced position. 1 Referring moreparticularly to the 'drawing, A designates a rock drill which may be ofthe Vdrifter type, and B a supporting shell for the rock drill A; Y' Theshell B has ltheV usual guideways C to slidably receive ribs carri-ed bythe cylinder E Vof the rock drill ,The rock drin Aim, the ugual from andback heads F and G which may be suitably Vingto move it bodilyrin thedirection Vwhich the piston is traveling.

Y that its .rear

securedto the cylinder-E by meansof side rods H. yThe front head F actsas a guide for a .working implement, such as a drill steel J, and withinthe cylinder is a reciprocatory hammer piston-K -to deliver'blows ofimpact against the working implementJ 'for vdriving it into the work. f

The pressure Huid utilized' for actuating the piston K may bedistributed to the ends of the cylinder E by any suitable form of disftributing valve (not shown) and communication `between .the distributing'valve and the source of pressure fluid supply may be controlled by asuitable throttlevalve, only the manipulating lever L of which is shown.

In accordance with the present invention means are providedA forenabling the rock drill A to be moved longitudinally of the shell B bythe jar resulting Aupon reversal of the hammer piston K at the endsofitsstroke.

As'will be readily understood hammer pistons of this type travel at ahigh rate of speedl so that upon the impact of the hammer piston againstthe Working implement as Well as'when the piston reverses itsdirectionof movement, at the end of its return stroke a heavy jar is imparted tothe vrock drill tend- 1n It is an *object of this invention to utilizesuch shocks or jars for actuating theentire rockv drill longitudinallyofthe shell. The rock drill is accordingly provided with read-` ilyyadjustable meanswhich are adapted to intermittently seizeand release theshell B or elements iixedly secured thereto to pre# vent recoilof-.therockdrill when the piston reverses in one end of theV cylindenandtoV enable the rock drill to -be` moved along" the shell by the jarresulting upon reversal of the piston in theother end of the cylinder.VThe stationary means associated with the shell B mentionedhereinbeforemay consist Y Y y of a rod O which is preferably disposedWithin the coniines of the shell Bgand isseated with -itsfforward end ina bearing plate `P secured to thefront end of the shell B by means ofbolts Q. The rod() is preferably of cylindrical form and maybe of suchlength end extends beyond the correspondinglend'of the shell B. yInstructures wherein the length'of the rod O exceeds that of the shell Bthe rear end of the rod() may be suitably supported by a cross head Rwhich Y itself .is supported by bolts S, secured in any suitable mannerto the rearendof the shellv B. y Preferably the rod O is providedwith aflange T rto seat against the inner surface of thecross head R'Aandtheend Uroftherod O which projects rearwardly ofthe cross head VR isthreaded to receive a nut V wherebyy therod may be secured iXedlyagainstendwise movement. `This arrangement' also enables the position ofthe rod Oto-bevreadily lchanged whenever it is Adesired to ypresent anew bearing. vsurface for the*l element where- 1with. the rod O isadapted to. cooperatei for advancing the rockdrill` A. relatively: tothe stancehas a lateral ange Z whichis seated` against the back end'ofthe back head G. In the flange Z are apertures?) tofaccommodate the siderods 'H ofthe rock drill andv whereby the bracket Y maybe securelyclamped? to the' back head Gr; f Y

Y Thelink W is ladapted-to assume-alateral position' with respect torthe'rod and hasin its free end an aperture c throughfwhichfthe rod,O'extendsand the aperture c is` of some-V what larger diameter thanthevrod Orso-that the link ,WV willrbe7 capable of some degree ofoscillatory movement with-respecty to the g The front and rearends oredges' of the aperture c constitutes-grippingedgesl andev respectivelywhich,`whenthe linkW occupies aninclinedposition, are adapted.. to gripfthe sur-face off'the rod'Ofor preventingrecoil of the yrock drill,dependingupon the direction in which itis intendedY to-actuatevthe rockdrill and Yupon the direction-in which the link V'inclines'., Y

f Means are providedftoholdthe link in thedesired operative positionand-'to'urge the saidlink constantly in position to assure an immediategripping actionv thereof on the rodU-and thus avoid anyrtendency of therock drill A to recoil rupon the occurrence of a; shock dueto'the'reversal of the Ypiston-CK inthe cylinder EL The means providedfor this' purpose comprises aiguide rod ,f which extends slidablythrough` an apertureg in the f link W and `in this instance locatedintermei diate the aperture "c and the bolt'Xv.

. The guide'rodf` may be of suitable length disposed' forwardly andrearwardly respectively. of the link W and againstprwhich they end oftheguide rod f is a head k ragainst f which the rear end of the` spring'j is adapted .to-bean' and on the front end ofthe guide rod 'f isthreaded a-nut oto forni a seat for the front end of the spring L andalso to vary the tension-ofthe springs h1 and j. Y'

In order to enable the link Wto be manually adj usted'tothevarious'positions which it may assume as well as to selectively setupa tension in either of the springs h and j',

the head1@ of thefguiderod f is pivotally connected toa lever p whichhas a shaft g seat with their adjacent ends. 0n the rear `r 'rsijournalled in the bracketY so that when the lever p is oscillated in onedirectionV or the other, one of the springs L or j will be comsity ofconstantly applying pressure kto thek pressed to.v exert a yieldablepressure against f lever.Y 7 f'or the purpose of insuring ythe correctposition of the link W,'thegrip portion s of the lever 1 is providedwith a bore t to accommodate a spring pressed plunger@ having a head c)which is adapted toV engage sei-rations fw forlocking the levers p and 1in the desired operative position. The` serrations w may be suitablyformed in arcuate formation on the side of the bracket Y so that anample contact between the vhead v of the plunger 'a and the saidserrations will be assured. Y Y v Y Y v The locking contact betweentheheadv 'v of the plunger u and the'serrationsis preferably such thatthe levers Y' and p will remain in position to hold one orthe otherofthe springs 7L or j'under compression unaffected by thevibrationsincidentto the operation of the'd'rilly A. Y

To theend that the linkv W' may be au-A tomatically reversed from theposition' which A plunger 3 has' a'hollow headwhichlies within the bore2 an-d a spring 4 seating with one end against one end. of" the bore 2actswith it-s otherendv against the Y'plungerA 3' to hold said plungerin thekrear end of the bore 2.

A convenientl support is provided fortli'e bearing a and said supportconnprises a main clampingmember 5 whichembraces the'shell `to receive apair'of springs and'jwh-ich are Band carries on one 'endhooksV 6 whichmay comprises a bearing a the shell B designated generallyl by a', isprovided to 'act Y engage the edge of the shell B: In .the oppo-- siteside of the clamping member is disposedt a shoe .7 which may be movedlaterallyl of thel shell B by means of a set screw 8 in the4 clampingmember 5. The shoe 7 may also be' provided with a hooked portion 9-tooverlie the edge of the shell adjacent to the shoe. This arrangementenables the 'clamping member 5, as well as the plunger, to be readilyadjusted along the length of the 4shellby merely manipulating the screwSto-freleasel the clamping hold on the shell after, which the clamptogether with the abutment may be readily shifted along the length ofthe shell. The operation of the device is asfollows:` Let it be assumedthat the .rock drillA is'in` is of course essential that the said rockdrill be actuated longitudinally of the shell B in the direction of thework so Vthat the full force of the hammer piston against the workingimplement J may be effective for driving the'said worki ng implementinto the work.

In order to constantly assure this position` of the percussive elementof the drill with respect to the working implement J the levers 1 and pmay be` rocked forwardly t'o cause f the link W to assume a similarposition. The

i au" spring 7' will thus be compressed so that it constantly tends toforce the linklW in the direction in which it `is desired to move therockdrill A. In this position of the link W the gripping edge e, whichis the rear edge of the aperture c, will frictionally engage the surfaceof the rod O, and the link W will be maintained in this position as willalso the levers r and p by the plunger u which engages one of thelserrations w.

With the rock drill in operation the jar caused by the hammer piston asit strikes the working implement J and by its act of reversal will betransmitted tothe rock drill so that as the rock is being graduallyreduced by the working implement the rock drill A will be carriedforwardly bodily in the direc-Y tion of the work. By `its grippingaction upon the rod O the link W will prevent the rock drill fromrecoiling so thatl the rock drill will be held ixedly in position andthe maximum effect of the blow of the hammerpiston K against the workingimplement J will therefore be obtained. In the subsequent operation ofthe rock drill this cycle will-be repeated until the working implement Jhas penetrated the work to the desired depth. The linkW will alternatelygrip and release the rod O in such wise that any movement of the rockdrill resulting from the jars of the piston K will only be in aforwardly direction since, when the piston K changes its direction ofmovement in the rear end of the cylinder E, the rock drill will plunger3; 'The spring 4 will thenbe compressed by the continued forwardmovement of the rock drill yuntil the plunger strikes .the

front endl of thelbore 2 in the abutment e.;

Thereafter Vas thedrill proceeds forwardly the levers#a and p will begradually oscillated4 rearwardly, as will also bethe' guide rod `f, thusreleasing thecompression in the springj and .placing 'the spring bundercompression".`

This movement ofthe 'levers will, of course,

also be expedited somewhat by -the'force pre-fv viously stored inthespring. i 1

As willl readily be seen, by changing p position'of the levers 7' and.Ap `and by placing the spring under compression the position' j, of thelinks W will also bereversedtthus bringing thel gripping edge al into aposition to frictionally engage the rod O. Meanwhile Y the rock drill A-will continue its operation, 1

and with the link W inthe new position the gripping edge cl willintermittently grip and release the rodO. Therefore, when thepis'- tonreverses its direction of movement in the frontend of the cylinder E thegripping edge el will prevent the rock drill from `being carriedforwardly, and at the end ofthe rearward stroke of the piston K the jarcaused by the reversal of the piston `will cause thev rock drill A to bemovedvbodil'y infa rearwardly direction to return it to itsinitialposition preparatory to the drilling of a newhole. j

In practice, the present invention has been found to be extremely'eflicient This is` largely due to the fact that the percussive elemento f the drill will always be in the proper positionl relatively to thedrill steel so that the maximum effect of the blow thereto may beobtained, and lalsoinf-part due to the fact that the 'drill is' notVsubjected to a heavy pressure-tending to drive-it 'in the direction ofthe work. The link merely holds the rock drill immovable. to preventrecoil thereof during the reversal of the piston at the end of onestrokeV and allows'thelrock drill to be actuated alo-ng the shell duringthe reversal of the piston at the end of the return stroke. l Ve claim:A

ico

lll)

l. Ina feedingdevice, the combination of? agsupportand a motor slidablysupportedby the support, a working implement, a hammer pistonreciprocable in the'motor to actuate the working implement'and to move,A

the motor longitudinally ofthe support, a rod supportedV by the support,a linkcarried Yby the motorto frictionally engage the rod' forpreventing recoil of theymotor during the motor., aspringiassociatedWith, thegsaid?v meansV and I:acting Vagainst the link toi;y main*-1tain the link in frictional Contact Witlii' the rodf and separate pivotsfor the link` and; the adjusting means. y -f .l

2. Inaffe'edin device, the combination of" a` support andV ar motorslidably supported. by thesupport, a Workingimple'ment,.a hamT merpistonreci'procable in the motorwto,v actuate thezworking -implement'andto, actuate f themotor longitudinally.ofthesupportp a.

vrrod supported. by the support, :al link: carried bythe motor toVfrictionally engage the rod Y for. preventing recoil` ofthe motor,manually.

operable spring.4 Vpressed means;` acting against the, link to` maintainsaldi-link` 1n,k

Vfrictional engagement Withrcthe .rod and means on. vthe support formingan abutment for the spring; pressed meansito shiftthe link. and thus,ycause the motor to movel in al reverse'direction'. 'y c v 'In` ayfeeding device,zthe combination of avvsupport and aimotorslidably-supported by 'thesuppora a Working implement, a. hammer Apistonreciprocable in thev motor to Aacltuatethe Working-implementand toactuate rod supported by the-support, a, link carthe linkinto frictionalengagement With the the motor longitudinally. ofV the support, al

rod. l

14;. In a feeding device, the. lcombination of ar support and a. motor`slidablyysupported by thesupport,a Working implement, a hammer pistonreciprocable inthe motor to ac tuate the Working implement and toactuate the'r motor longitudinally of the support, a

Y rod supported by thel support, av bracket carried by the motor, a link`p ivoted Vto the thea-i` working implement. and to movel the; l.

motor, longitudinally' of kthe:sup]g ort=,a rod:A

supportedf .by the support, i a link carried: by

themotorto frictionally engage the rodi for preventing recoil; ofa themotor upon` revers al ofthev piston at Vthe end 0i' one vstroke andtorelease the. rod;r upon; reversal Vof the /piston', at t-lieendV of;the opposite stroke, a; guide rodi-extending .slidablyr through thelink,l

'springs on. the; guide rod: acting,- .against the opposite; sides of?.the'. flink, a 'lever on, the

motorv pivotally connected; to; thei guidev4 rod 4foradjustingthepositionA of the link and to place oneA orfthe other of the springsunder compression for urgingA the link into fric-y tional.. engagementWith the rod, a bearing adapted tol be' secured to, the support, and

a spring pressed plungerin the bearing to reverse the` 'said means andthe flink, thereby` enabling'the motor to be actuated in 'ai reversedirection by 'the piston.

'6; In ai-frfeerdingk device, the combina-tion.y

with aV support and: av percussive motor on thel supportI andbeingsubjectedito jars incident te its operation tending to movey theymotoralong the support', ofrecoilarresting;

meansforA themotor; ,and means on,y theV sup-Y port;V to I shift therecoil arresting means-for` reversing; thefdirection ofi movementl ofthe'i motor relativelyftotlesupport.

In Vtestimony whereof; We have signed; this specification Y ,WILLIAMA.,SMI-TH, SR;

bracket and adapted to frictionally engage u the rod, spring pressedmeans for urging c y the linkjinto frictional contactwith the rod,

a lever -pivotally connected to they bracket and to the said` means foradjustinglthe posi- VtionV of the link to enable the motorto travelineither directionrelatively to the support,-

4 serrations on the bracket, and a` spring,

i pressed plunger in the lever-to engage the, Y serrations for lockingthe' link in( they adi justed position.

l5. In va feeding device, thek combination Y of a supp'ortand amotor`slidably supported thereby, a Working implement, a hammer, pistonreciprocable .in ,1 the: motor to actuatee

